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* Btrfs: improve replacing nocow extentsJosef Bacik2013-09-211-14/+98
| | | | | | | | | | | | | | | | Various people have hit a deadlock when running btrfs/011. This is because when replacing nocow extents we will take the i_mutex to make sure nobody messes with the file while we are replacing the extent. The problem is we are already holding a transaction open, which is a locking inversion, so instead we need to save these inodes we find and then process them outside of the transaction. Further we can't just lock the inode and assume we are good to go. We need to lock the extent range and then read back the extent cache for the inode to make sure the extent really still points at the physical block we want. If it doesn't we don't have to copy it. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrf: cleanup: don't check for root_refs == 0 twiceStefan Behrens2013-09-011-5/+0
| | | | | | | | | | btrfs_read_fs_root_no_name() already checks if btrfs_root_refs() is zero and returns ENOENT in this case. There is no need to do it again in three more places. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: Format mirror_num as intGeert Uytterhoeven2013-09-011-3/+3
| | | | | | | | | mirror_num is always "int", hence don't cast it to "unsigned long long" and format it as a 64-bit number. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: Format PAGE_SIZE as unsigned longGeert Uytterhoeven2013-09-011-3/+2
| | | | | | | | | PAGE_SIZE is "unsigned long" everywhere, so there's no need to cast it to "unsigned long long" and format it as a 64-bit number. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: Remove superfluous casts from u64 to unsigned long longGeert Uytterhoeven2013-09-011-11/+5
| | | | | | | | | u64 is "unsigned long long" on all architectures now, so there's no need to cast it when formatting it using the "ll" length modifier. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* btrfs: Cleanup for using BTRFS_SETGET_STACK instead of raw convertQu Wenruo2013-09-011-6/+6
| | | | | | | | | | | | | | Some codes still use the cpu_to_lexx instead of the BTRFS_SETGET_STACK_FUNCS declared in ctree.h. Also added some BTRFS_SETGET_STACK_FUNCS for btrfs_header btrfs_timespec and other structures. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: Miao Xie <miaoxie@cn.fujitsu.com> Reviewed-by: David Sterba <dsterba@suse.cz> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: fix wrong write offset when replacing a deviceStefan Behrens2013-07-191-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Miao Xie reported the following issue: The filesystem was corrupted after we did a device replace. Steps to reproduce: # mkfs.btrfs -f -m single -d raid10 <device0>..<device3> # mount <device0> <mnt> # btrfs replace start -rfB 1 <device4> <mnt> # umount <mnt> # btrfsck <device4> The reason for the issue is that we changed the write offset by mistake, introduced by commit 625f1c8dc. We read the data from the source device at first, and then write the data into the corresponding place of the new device. In order to implement the "-r" option, the source location is remapped using btrfs_map_block(). The read takes place on the mapped location, and the write needs to take place on the unmapped location. Currently the write is using the mapped location, and this commit changes it back by undoing the change to the write address that the aforementioned commit added by mistake. Reported-by: Miao Xie <miaox@cn.fujitsu.com> Cc: <stable@vger.kernel.org> # 3.10+ Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: fix several potential problems in copy_nocow_pages_for_inodeMiao Xie2013-07-021-1/+22
| | | | | | | | | | - It makes no sense that we deal with a inode in the dead tree. - fix the race between dio and page copy by waiting the dio completion - avoid the page copy vs truncate/punch hole - check if the page is in the page cache or not Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: cleanup the code of copy_nocow_pages_for_inode()Miao Xie2013-07-021-25/+23
| | | | | | | | | | | | - It make no sense that we continue to do something after the error happened, just go back with this patch. - remove some check of copy_nocow_pages_for_inode(), such as page check after write, inode check in the end of the function, because we are sure they exist. - remove the unnecessary goto in the return value check of the write Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: fix oops when recovering the file data by scrub functionMiao Xie2013-07-021-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We get oops while running btrfs replace start test, ------------[ cut here ]------------ kernel BUG at mm/filemap.c:608! [SNIP] Call Trace: [<ffffffffa04b36c7>] copy_nocow_pages_for_inode+0x217/0x3f0 [btrfs] [<ffffffffa04b34b0>] ? scrub_print_warning_inode+0x230/0x230 [btrfs] [<ffffffffa04b34b0>] ? scrub_print_warning_inode+0x230/0x230 [btrfs] [<ffffffffa04bb8ce>] iterate_extent_inodes+0x1ae/0x300 [btrfs] [<ffffffffa04bbab2>] iterate_inodes_from_logical+0x92/0xb0 [btrfs] [<ffffffffa04b34b0>] ? scrub_print_warning_inode+0x230/0x230 [btrfs] [<ffffffffa04b3b07>] copy_nocow_pages_worker+0x97/0x150 [btrfs] [<ffffffffa048eed4>] worker_loop+0x134/0x540 [btrfs] [<ffffffff816274ea>] ? __schedule+0x3ca/0x7f0 [<ffffffffa048eda0>] ? btrfs_queue_worker+0x300/0x300 [btrfs] [<ffffffff8106f2f0>] kthread+0xc0/0xd0 [<ffffffff8106f230>] ? flush_kthread_worker+0x80/0x80 [<ffffffff8163181c>] ret_from_fork+0x7c/0xb0 [<ffffffff8106f230>] ? flush_kthread_worker+0x80/0x80 [SNIP] RIP [<ffffffff8111f4c5>] unlock_page+0x35/0x40 RSP <ffff88010316bb98> ---[ end trace 421e79ad0dd72c7d ]--- it is because we forgot to lock the page again after we read data to the page. Fix it. Signed-off-by: Lin Feng <linfeng@cn.fujitsu.com> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: remove btrfs_sector_sum structureMiao Xie2013-07-021-11/+5
| | | | | | | | | | | | | | | | | | | | Using the structure btrfs_sector_sum to keep the checksum value is unnecessary, because the extents that btrfs_sector_sum points to are continuous, we can find out the expected checksums by btrfs_ordered_sum's bytenr and the offset, so we can remove btrfs_sector_sum's bytenr. After removing bytenr, there is only one member in the structure, so it makes no sense to keep the structure, just remove it, and use a u32 array to store the checksum value. By this change, we don't use the while loop to get the checksums one by one. Now, we can get several checksum value at one time, it improved the performance by ~74% on my SSD (31MB/s -> 54MB/s). test command: # dd if=/dev/zero of=/mnt/btrfs/file0 bs=1M count=1024 oflag=sync Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: free csums when we're done scrubbing an extentJosef Bacik2013-07-011-0/+1
| | | | | | | | | | | A user reported scrub taking up an unreasonable amount of ram as it ran. This is because we lookup the csums for the extent we're scrubbing but don't free it up until after we're done with the scrub, which means we can take up a whole lot of ram. This patch fixes this by dropping the csums once we're done with the extent we've scrubbed. The user reported this to fix their problem. Thanks, Reported-and-tested-by: Remco Hosman <remco@hosman.xs4all.nl> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: use a btrfs bioset instead of abusing bio internalsChris Mason2013-05-171-5/+5
| | | | | | | | | | | | | | | | | | | | | Btrfs has been pointer tagging bi_private and using bi_bdev to store the stripe index and mirror number of failed IOs. As bios bubble back up through the call chain, we use these to decide if and how to retry our IOs. They are also used to count IO failures on a per device basis. Recently a bio tracepoint was added lead to crashes because we were abusing bi_bdev. This commit adds a btrfs bioset, and creates explicit fields for the mirror number and stripe index. The plan is to extend this structure for all of the fields currently in struct btrfs_bio, which will mean one less kmalloc in our IO path. Signed-off-by: Chris Mason <chris.mason@fusionio.com> Reported-by: Tejun Heo <tj@kernel.org>
* Btrfs: improve the loop of scrub_stripeLiu Bo2013-05-061-26/+57
| | | | | | | | | | | | | | | | | | | | | | | | | 1) Right now scrub_stripe() is looping in some unnecessary cases: * when the found extent item's objectid has been out of the dev extent's range but we haven't finish scanning all the range within the dev extent * when all the items has been processed but we haven't finish scanning all the range within the dev extent In both cases, we can just finish the loop to save costs. 2) Besides, when the found extent item's length is larger than the stripe len(64k), we don't have to release the path and search again as it'll get at the same key used in the last loop, we can instead increase the logical cursor in place till all space of the extent is scanned. 3) And we use 0 as the key's offset to search btree, then get to previous item to find a smaller item, and again have to move to the next one to get the right item. Setting offset=-1 and previous_item() is the correct way. 4) As we won't find any checksum at offset unless this 'offset' is in a data extent, we can just find checksum when we're really going to scrub an extent. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* btrfs: make static code static & remove dead codeEric Sandeen2013-05-061-22/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Big patch, but all it does is add statics to functions which are in fact static, then remove the associated dead-code fallout. removed functions: btrfs_iref_to_path() __btrfs_lookup_delayed_deletion_item() __btrfs_search_delayed_insertion_item() __btrfs_search_delayed_deletion_item() find_eb_for_page() btrfs_find_block_group() range_straddles_pages() extent_range_uptodate() btrfs_file_extent_length() btrfs_scrub_cancel_devid() btrfs_start_transaction_lflush() btrfs_print_tree() is left because it is used for debugging. btrfs_start_transaction_lflush() and btrfs_reada_detach() are left for symmetry. ulist.c functions are left, another patch will take care of those. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: add a incompatible format change for smaller metadata extent refsJosef Bacik2013-05-061-10/+20
| | | | | | | | | | | | | | | | We currently store the first key of the tree block inside the reference for the tree block in the extent tree. This takes up quite a bit of space. Make a new key type for metadata which holds the level as the offset and completely removes storing the btrfs_tree_block_info inside the extent ref. This reduces the size from 51 bytes to 33 bytes per extent reference for each tree block. In practice this results in a 30-35% decrease in the size of our extent tree, which means we COW less and can keep more of the extent tree in memory which makes our heavy metadata operations go much faster. This is not an automatic format change, you must enable it at mkfs time or with btrfstune. This patch deals with having metadata stored as either the old format or the new format so it is easy to convert. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: cleanup unused arguments of btrfs_csum_dataLiu Bo2013-05-061-8/+5
| | | | | | | Argument 'root' is no more used in btrfs_csum_data(). Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: don't drop path when printing out tree errors in scrubJosef Bacik2013-03-291-1/+2
| | | | | | | | | | | | A user reported a panic where we were panicing somewhere in tree_backref_for_extent from scrub_print_warning. He only captured the trace but looking at scrub_print_warning we drop the path right before we mess with the extent buffer to print out a bunch of stuff, which isn't right. So fix this by dropping the path after we use the eb if we need to. Thanks, Cc: stable@vger.kernel.org Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Merge branch 'raid56-experimental' into for-linus-3.9Chris Mason2013-02-201-0/+8
|\ | | | | | | | | | | | | | | | | | | Signed-off-by: Chris Mason <chris.mason@fusionio.com> Conflicts: fs/btrfs/ctree.h fs/btrfs/extent-tree.c fs/btrfs/inode.c fs/btrfs/volumes.c
| * Btrfs: RAID5 and RAID6David Woodhouse2013-02-011-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This builds on David Woodhouse's original Btrfs raid5/6 implementation. The code has changed quite a bit, blame Chris Mason for any bugs. Read/modify/write is done after the higher levels of the filesystem have prepared a given bio. This means the higher layers are not responsible for building full stripes, and they don't need to query for the topology of the extents that may get allocated during delayed allocation runs. It also means different files can easily share the same stripe. But, it does expose us to incorrect parity if we crash or lose power while doing a read/modify/write cycle. This will be addressed in a later commit. Scrub is unable to repair crc errors on raid5/6 chunks. Discard does not work on raid5/6 (yet) The stripe size is fixed at 64KiB per disk. This will be tunable in a later commit. Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* | Btrfs: use bit operation for ->fs_stateMiao Xie2013-02-201-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is no lock to protect fs_info->fs_state, it will introduce some problems, such as the value may be covered by the other task when several tasks modify it. For example: Task0 - CPU0 Task1 - CPU1 mov %fs_state rax or $0x1 rax mov %fs_state rax or $0x2 rax mov rax %fs_state mov rax %fs_state The expected value is 3, but in fact, it is 2. Though this problem doesn't happen now (because there is only one flag currently), the code is error prone, if we add other flags, the above problem will happen to a certainty. Now we use bit operation for it to fix the above problem. In this way, we can make the code more robust and be easy to add new flags. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* | Btrfs: fix race between snapshot deletion and getting inodeLiu Bo2013-02-051-5/+20
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | While running snapshot testscript created by Mitch and David, the race between autodefrag and snapshot deletion can lead to corruption of dead_root list so that we can get crash on btrfs_clean_old_snapshots(). And besides autodefrag, scrub also does the same thing, ie. read root first and get inode. Here is the story(take autodefrag as an example): (1) when we delete a snapshot or subvolume, it will set its root's refs to zero and do a iput() on its own inode, and if this inode happens to be the only active in-meory one in root's inode rbtree, it will add itself to the global dead_roots list for later cleanup. (2) after (1), the autodefrag thread may read another inode for defrag and the inode is just in the deleted snapshot/subvolume, but all of these are without checking if the root is still valid(refs > 0). So the end up result is adding the deleted snapshot/subvolume's root to the global dead_roots list AGAIN. Fortunately, we already have a srcu lock to avoid the race, ie. subvol_srcu. So all we need to do is to take the lock to protect 'read root and get inode', since we synchronize to wait for the rcu grace period before adding something to the global dead_roots list. Reported-by: Mitch Harder <mitch.harder@sabayonlinux.org> Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: fix BUG() in scrub when first superblock reading gives EIOStefan Behrens2012-12-161-0/+11
| | | | | | | | | | | | | | | This fixes a very special case that can be reproduced by just disconnecting a disk at runtime, and without unmounting the filesystem first, start scrub on the filesystem with the disconnected disk. All read and write EIOs are handled correctly, only the first superblock is an exception and gives a BUG() in a subfunction. The BUG() is correct, it would crash later otherwise. The subfunction must not be called for superblocks and this is what the fix changes. Reported-by: Joeri Vanthienen <mail@joerivanthienen.be> Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: fix a scrub regression in case of write errorsStefan Behrens2012-12-161-1/+2
| | | | | | | | | | This regression was introduced by the device-replace patches. Scrub immediately stops checking those disks that have write errors. This is nothing that happens in the real world, but it is wrong since scrub is the tool to detect and repair defects. Fix it. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: introduce GET_READ_MIRRORS functionality for btrfs_map_block()Stefan Behrens2012-12-121-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | Before this commit, btrfs_map_block() was called with REQ_WRITE in order to retrieve the list of mirrors for a disk block. This needs to be changed for the device replace procedure since it makes a difference whether you are asking for read mirrors or for locations to write to. GET_READ_MIRRORS is introduced as a new interface to call btrfs_map_block(). In the current commit, the functionality is not yet changed, only the interface for GET_READ_MIRRORS is introduced and all the places that should use this new interface are adapted. The reason that REQ_WRITE cannot be abused anymore to retrieve a list of read mirrors is that during a running dev replace operation all write requests to the live filesystem are duplicated to also write to the target drive. Keep in mind that the target disk is only partially a valid copy of the source disk while the operation is ongoing. All writes go to the target disk, but not all reads would return valid data on the target disk. Therefore it is not possible anymore to abuse a REQ_WRITE interface to find valid mirrors for a REQ_READ. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: change core code of btrfs to support the device replace operationsStefan Behrens2012-12-121-1/+6
| | | | | | | | This commit contains all the essential changes to the core code of Btrfs for support of the device replace procedure. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: add code to scrub to copy read data to another diskStefan Behrens2012-12-121-71/+812
| | | | | | | | | | | | | | | | | | | | | | The device replace procedure makes use of the scrub code. The scrub code is the most efficient code to read the allocated data of a disk, i.e. it reads sequentially in order to avoid disk head movements, it skips unallocated blocks, it uses read ahead mechanisms, and it contains all the code to detect and repair defects. This commit adds code to scrub to allow the scrub code to copy read data to another disk. One goal is to be able to perform as fast as possible. Therefore the write requests are collected until huge bios are built, and the write process is decoupled from the read process with some kind of flow control, of course, in order to limit the allocated memory. The best performance on spinning disks could by reached when the head movements are avoided as much as possible. Therefore a single worker is used to interface the read process with the write process. The regular scrub operation works as fast as before, it is not negatively influenced and actually it is more or less unchanged. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: disallow some operations on the device replace target deviceStefan Behrens2012-12-121-5/+9
| | | | | | | | This patch adds some code to disallow operations on the device that is used as the target for the device replace operation. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: pass fs_info instead of rootStefan Behrens2012-12-121-42/+34
| | | | | | | | | | | | A small number of functions that are used in a device replace procedure when the operation is resumed at mount time are unable to pass the same root pointer that would be used in the regular (ioctl) context. And since the root pointer is not required, only the fs_info is, the root pointer argument is replaced with the fs_info pointer argument. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: pass fs_info to btrfs_map_block() instead of mapping_treeStefan Behrens2012-12-121-7/+7
| | | | | | | | | This is required for the device replace procedure in a later step. Two calling functions also had to be changed to have the fs_info pointer: repair_io_failure() and scrub_setup_recheck_block(). Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: cleanup scrub bio and worker wait codeStefan Behrens2012-12-121-35/+71
| | | | | | | Just move some code into functions to make everything more readable. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: in scrub repair code, simplify alloc error handlingStefan Behrens2012-12-121-35/+26
| | | | | | | | | | | In the scrub repair code, the code is changed to handle memory allocation errors a little bit smarter. The change is to handle it just like a read error. This simplifies the code and removes a couple of lines of code, since the code to handle read errors is there anyway. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: in scrub repair code, optimize the reading of mirrorsStefan Behrens2012-12-121-23/+12
| | | | | | | | | | | | In case that disk blocks need to be repaired (rewritten), the current code at first (for simplicity reasons) reads all alternate mirrors in the first step, afterwards selects the best one in a second step. This is now changed to read one alternate mirror after the other and to leave the loop early when a perfect mirror is found. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: make the scrub page array dynamically allocatedStefan Behrens2012-12-121-74/+121
| | | | | | | | | | | | | | | | With the modified design (in order to support the devive replace procedure) it is necessary to alloc the page array dynamically. The reason is that pages are reused. At first a page is used for the bio to read the data from the filesystem, then the same page is reused for the bio that writes the data to the target disk. Since the read process and the write process are completely decoupled, this requires a new concept of refcounts and get/put functions for pages, and it requires to use newly created pages for each read bio which are freed after the write operation is finished. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: remove the block device pointer from the scrub context structStefan Behrens2012-12-121-60/+73
| | | | | | | | | | | | | | | | | | | | The block device is removed from the scrub context state structure. The scrub code as it is used for the device replace procedure reads the source data from whereever it is optimal. The source device might even be gone (disconnected, for instance due to a hardware failure). Or the drive can be so faulty so that the device replace procedure tries to avoid access to the faulty source drive as much as possible, and only if all other mirrors are damaged, as a last resort, the source disk is accessed. The modified scrub code operates as if it would handle the source drive and thereby generates an exact copy of the source disk on the target disk, even if the source disk is not present at all. Therefore the block device pointer to the source disk is removed in the scrub context struct and moved into the lower level scope of scrub_bio, fixup and page structures where the block device context is known. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: rename the scrub context structureStefan Behrens2012-12-121-252/+252
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The device replace procedure makes use of the scrub code. The scrub code is the most efficient code to read the allocated data of a disk, i.e. it reads sequentially in order to avoid disk head movements, it skips unallocated blocks, it uses read ahead mechanisms, and it contains all the code to detect and repair defects. This commit is a first preparation step to adapt the scrub code to be shareable for the device replace procedure. The block device will be removed from the scrub context state structure in a later step. It used to be the source block device. The scrub code as it is used for the device replace procedure reads the source data from whereever it is optimal. The source device might even be gone (disconnected, for instance due to a hardware failure). Or the drive can be so faulty so that the device replace procedure tries to avoid access to the faulty source drive as much as possible, and only if all other mirrors are damaged, as a last resort, the source disk is accessed. The modified scrub code operates as if it would handle the source drive and thereby generates an exact copy of the source disk on the target disk, even if the source disk is not present at all. Therefore the block device pointer to the source disk is removed in a later patch, and therefore the context structure is renamed (this is the goal of the current patch) to reflect that no source block device scope is there anymore. Summary: This first preparation step consists of a textual substitution of the term "dev" to the term "ctx" whereever the scrub context is used. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* btrfs: Kill some bi_idx referencesKent Overstreet2012-10-011-15/+0
| | | | | | | | | | | | | | | | | | For immutable bio vecs, I've been auditing and removing bi_idx references. These were harmless, but removing them will make auditing easier. scrub_bio_end_io_worker() was open coding a bio_reset() - but this doesn't appear to have been needed for anything as right after it does a bio_put(), and perusing the code it doesn't appear anything else was holding a reference to the bio. The other use end_bio_extent_readpage() was just for a pr_debug() - changed it to something that might be a bit more useful. Signed-off-by: Kent Overstreet <koverstreet@google.com> CC: Chris Mason <chris.mason@oracle.com> CC: Stefan Behrens <sbehrens@giantdisaster.de>
* Btrfs: fix a bug in parsing return value in logical resolveLiu Bo2012-10-011-6/+8
| | | | | | | | | | | | | In logical resolve, we parse extent_from_logical()'s 'ret' as a kind of flag. It is possible to lose our errors because (-EXXXX & BTRFS_EXTENT_FLAG_TREE_BLOCK) is true. I'm not sure if it is on purpose, it just looks too hacky if it is. I'd rather use a real flag and a 'ret' to catch errors. Acked-by: Jan Schmidt <list.btrfs@jan-o-sch.net> Signed-off-by: Liu Bo <liub.liubo@gmail.com>
* Btrfs: fix possible memory leak in scrub_setup_recheck_block()Wei Yongjun2012-10-011-0/+1
| | | | | | | | | | bbio has been malloced in btrfs_map_block() and should be freed before leaving from the error handling cases. spatch with a semantic match is used to found this problem. (http://coccinelle.lip6.fr/) Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
* Btrfs: use rcu to protect device->nameJosef Bacik2012-06-141-12/+18
| | | | | | | | | | | | | | Al pointed out that we can just toss out the old name on a device and add a new one arbitrarily, so anybody who uses device->name in printk could possibly use free'd memory. Instead of adding locking around all of this he suggested doing it with RCU, so I've introduced a struct rcu_string that does just that and have gone through and protected all accesses to device->name that aren't under the uuid_mutex with rcu_read_lock(). This protects us and I will use it for dealing with removing the device that we used to mount the file system in a later patch. Thanks, Reviewed-by: David Sterba <dsterba@suse.cz> Signed-off-by: Josef Bacik <josef@redhat.com>
* Btrfs: add device counters for detected IO and checksum errorsStefan Behrens2012-05-301-16/+49
| | | | | | | | | | The goal is to detect when drives start to get an increased error rate, when drives should be replaced soon. Therefore statistic counters are added that count IO errors (read, write and flush). Additionally, the software detected errors like checksum errors and corrupted blocks are counted. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
* Merge branch 'for-linus' of ↵Linus Torvalds2012-05-061-0/+7
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs Pull btrfs fixes from Chris Mason: "The big ones here are a memory leak we introduced in rc1, and a scheduling while atomic if the transid on disk doesn't match the transid we expected. This happens for corrupt blocks, or out of date disks. It also fixes up the ioctl definition for our ioctl to resolve logical inode numbers. The __u32 was a merging error and doesn't match what we ship in the progs." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: Btrfs: avoid sleeping in verify_parent_transid while atomic Btrfs: fix crash in scrub repair code when device is missing btrfs: Fix mismatching struct members in ioctl.h Btrfs: fix page leak when allocing extent buffers Btrfs: Add properly locking around add_root_to_dirty_list
| * Btrfs: fix crash in scrub repair code when device is missingStefan Behrens2012-05-041-0/+7
| | | | | | | | | | | | | | | | | | | | Fix that when scrub tries to repair an I/O or checksum error and one of the devices containing the mirror is missing, it crashes in bio_add_page because the bdev is a NULL pointer for missing devices. Reported-by: Marco L. Crociani <marco.crociani@gmail.com> Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@oracle.com>
* | Merge branch 'for-linus' of ↵Linus Torvalds2012-04-281-15/+0
|\ \ | |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs Pull btrfs fixes from Chris Mason: "This has our collection of bug fixes. I missed the last rc because I thought our patches were making NFS crash during my xfs test runs. Turns out it was an NFS client bug fixed by someone else while I tried to bisect it. All of these fixes are small, but some are fairly high impact. The biggest are fixes for our mount -o remount handling, a deadlock due to GFP_KERNEL allocations in readdir, and a RAID10 error handling bug. This was tested against both 3.3 and Linus' master as of this morning." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (26 commits) Btrfs: reduce lock contention during extent insertion Btrfs: avoid deadlocks from GFP_KERNEL allocations during btrfs_real_readdir Btrfs: Fix space checking during fs resize Btrfs: fix block_rsv and space_info lock ordering Btrfs: Prevent root_list corruption Btrfs: fix repair code for RAID10 Btrfs: do not start delalloc inodes during sync Btrfs: fix that check_int_data mount option was ignored Btrfs: don't count CRC or header errors twice while scrubbing Btrfs: fix btrfs_ioctl_dev_info() crash on missing device btrfs: don't return EINTR Btrfs: double unlock bug in error handling Btrfs: always store the mirror we read the eb from fs/btrfs/volumes.c: add missing free_fs_devices btrfs: fix early abort in 'remount' Btrfs: fix max chunk size check in chunk allocator Btrfs: add missing read locks in backref.c Btrfs: don't call free_extent_buffer twice in iterate_irefs Btrfs: Make free_ipath() deal gracefully with NULL pointers Btrfs: avoid possible use-after-free in clear_extent_bit() ...
| * Btrfs: don't count CRC or header errors twice while scrubbingStefan Behrens2012-04-181-15/+0
| | | | | | | | | | | | Each CRC or header error was counted twice, this is now fixed. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
* | Merge branch 'for-linus-min' of ↵Linus Torvalds2012-04-131-0/+4
|\ \ | |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs Pull the minimal btrfs branch from Chris Mason: "We have a use-after-free in there, along with errors when mount -o discard is enabled, and a BUG_ON(we should compile with UP more often)." * 'for-linus-min' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: Btrfs: use commit root when loading free space cache Btrfs: fix use-after-free in __btrfs_end_transaction Btrfs: check return value of bio_alloc() properly Btrfs: remove lock assert from get_restripe_target() Btrfs: fix eof while discarding extents Btrfs: fix uninit variable in repair_eb_io_failure Revert "Btrfs: increase the global block reserve estimates"
| * Btrfs: check return value of bio_alloc() properlyTsutomu Itoh2012-04-121-0/+4
| | | | | | | | | | | | | | | | bio_alloc() has the possibility of returning NULL. So, it is necessary to check the return value. Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
* | Merge branch 'for-linus' of ↵Linus Torvalds2012-03-301-372/+1035
|\ \ | |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs Pull btrfs fixes and features from Chris Mason: "We've merged in the error handling patches from SuSE. These are already shipping in the sles kernel, and they give btrfs the ability to abort transactions and go readonly on errors. It involves a lot of churn as they clarify BUG_ONs, and remove the ones we now properly deal with. Josef reworked the way our metadata interacts with the page cache. page->private now points to the btrfs extent_buffer object, which makes everything faster. He changed it so we write an whole extent buffer at a time instead of allowing individual pages to go down,, which will be important for the raid5/6 code (for the 3.5 merge window ;) Josef also made us more aggressive about dropping pages for metadata blocks that were freed due to COW. Overall, our metadata caching is much faster now. We've integrated my patch for metadata bigger than the page size. This allows metadata blocks up to 64KB in size. In practice 16K and 32K seem to work best. For workloads with lots of metadata, this cuts down the size of the extent allocation tree dramatically and fragments much less. Scrub was updated to support the larger block sizes, which ended up being a fairly large change (thanks Stefan Behrens). We also have an assortment of fixes and updates, especially to the balancing code (Ilya Dryomov), the back ref walker (Jan Schmidt) and the defragging code (Liu Bo)." Fixed up trivial conflicts in fs/btrfs/scrub.c that were just due to removal of the second argument to k[un]map_atomic() in commit 7ac687d9e047. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (75 commits) Btrfs: update the checks for mixed block groups with big metadata blocks Btrfs: update to the right index of defragment Btrfs: do not bother to defrag an extent if it is a big real extent Btrfs: add a check to decide if we should defrag the range Btrfs: fix recursive defragment with autodefrag option Btrfs: fix the mismatch of page->mapping Btrfs: fix race between direct io and autodefrag Btrfs: fix deadlock during allocating chunks Btrfs: show useful info in space reservation tracepoint Btrfs: don't use crc items bigger than 4KB Btrfs: flush out and clean up any block device pages during mount btrfs: disallow unequal data/metadata blocksize for mixed block groups Btrfs: enhance superblock sanity checks Btrfs: change scrub to support big blocks Btrfs: minor cleanup in scrub Btrfs: introduce common define for max number of mirrors Btrfs: fix infinite loop in btrfs_shrink_device() Btrfs: fix memory leak in resolver code Btrfs: allow dup for data chunks in mixed mode Btrfs: validate target profiles only if we are going to use them ...
| * Merge git://git.jan-o-sch.net/btrfs-unstable into for-linusChris Mason2012-03-281-2/+2
| |\ | | | | | | | | | | | | | | | | | | Conflicts: fs/btrfs/transaction.c Signed-off-by: Chris Mason <chris.mason@oracle.com>
| | * Btrfs: fix regression in scrub path resolvingJan Schmidt2012-03-271-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In commit 4692cf58 we introduced new backref walking code for btrfs. This assumes we're searching live roots, which requires a transaction context. While scrubbing, however, we must not join a transaction because this could deadlock with the commit path. Additionally, what scrub really wants to do is resolving a logical address in the commit root it's currently checking. This patch adds support for logical to path resolving on commit roots and makes scrub use that. Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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